EDTA anticoagulant tube head cap is purple, the additive is EDTA which is a kind of amino polycarboxylic acid, it is suitable for general hematology test, blood routine test tube, glycated hemoglobin, the first choice of blood type test, it’s not suitable for coagulation test and platelet function test, also not suitable for the determination of calcium ion, potassium ion, sodium ion, iron ion, alkaline phosphatase, creatine kinase and leucine aminopeptidase. It is suitable for PCR test. During production, 100ml of 2.7%EDTA-K2 solution was sprayed on the inner wall of vacuum tube and dried at 45℃. When using, take blood up to 2mI, immediately reverse mix 5-8 times after blood drawing, mix well for use. The sample type required for testing is whole blood, which needs to be mixed when used.